"cloud" function doesn't plot
Tony Ross wrote:
From: "Simon Blomberg" <Simon.Blomberg at anu.edu.au> Date: Mon, 23 Jun 2003 16:26:39 +1000
If you type ?cloud, you can see that you need to provide a formula as well as a dataset. So if your variables are x,y,z in dataframe dat, then cloud(z~x*y, data=dat) should work.
[...]
is.matrix(sanity.MIF); is.numeric(sanity.MIF); dim(sanity.MIF); cloud(sanity.MIF)
[1] TRUE [1] TRUE [1] 2970 3
The "help(cloud)" facility states: "`formula' can be a matrix".
It states completely: "As an extension to partially support the form used in filled.contour and image, formula can be a matrix." Thus, see ?image that you don't need a 3 column matrix, but a matrix containing the z values. I'd suggest to convert the matrix to a data.frame and follow the suggestion from Simon Blomberg. Uwe Ligges
As I stated, I have a 3-column numeric matrix, so colum 3 should be plotted as a point above the 1st and 2nd column co-ordinates.
>
No plot is produced however, just a blank graphics device.
Uwe Ligges